package interceptor;

import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // 判断用户是否登陆
        HttpSession session = request.getSession();
        Object userInfo = session.getAttribute("user");

        if (userInfo == null){
            // 重定向
            response.sendRedirect("/");
            return false;
        }
        return true;
    }
}
